Control method for multi-module parallel connection operation of solar power system
A technology of power generation system and control method, which is applied in the field of solar power generation, can solve problems such as collapse, and achieve the effect of avoiding collapse and reducing requirements
Active Publication Date: 2017-05-17
SHANGHAI GHREPOWER GREEN ENERGY
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Problems solved by technology
The above multi-module parallel control method has extremely high requirements on the communication delay and communication bit error rate between modules, especially in the environment with serious electromagnetic interference, it is easy to crash during the tracking process
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[0021] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.
[0022] A solar power generation system with multiple modules running in parallel is composed of a main control unit and multiple voltage conversion modules, such as figure 2 As shown, one solar array corresponds to multiple voltage conversion modules, and the input sides of multiple voltage conversion modules operate in parallel.
[0023] The main control unit mainly samples the output voltage U and current I of the solar arr...
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The invention provides a control method for multi-module parallel connection operation of solar power system. The control method comprises a main control unit and a plurality of voltage conversion modules. The main control unit samples the output voltage and current of a solar array and performs the maximum power point tracking. The voltage conversion module internally inserts a set of input voltages - output power curve as a reference for a power control loop of a voltage conversion module; an intersection of the input voltage - output power curve and a power curve of the solar array is the total power extracted by the voltage conversion module from the solar array; by modifying a voltage - power curve inside the voltage conversion module, the main control unit adjusts the power extracted from the solar array, and then realizes the maximum power point tracking function. The invention has the advantage of avoiding a tracking process crash and reducing a real-time requirement for external communication of the module. If the tracking process between a short communication failure, it will not cause tracking crash.
Description
technical field [0001] The invention belongs to the technical field of solar power generation, and relates to a control technology of a solar power generation system, in particular to a coordinated operation mechanism of maximum power point tracking of a multi-module parallel-operated solar power generation system. Background technique [0002] At present, solar power generation systems on the market are divided into two types: input non-parallel type and input parallel type. The input non-parallel type means that one solar array corresponds to one voltage conversion module, and each module independently performs maximum power point tracking, such as figure 1 shown. The input parallel type means that one solar array corresponds to multiple voltage conversion modules, and the input sides of multiple modules operate in parallel, such as figure 2 shown. The system advantages of the input parallel type have the advantages of convenient expansion and redundant configuration, ...
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IPC IPC(8): H02J3/38G05F1/67
CPCG05F1/67H02J3/385Y02E10/56
Inventor 张中伟俞卫陈浩梁晓兵
Owner SHANGHAI GHREPOWER GREEN ENERGY